Cooler box



FIG. 1 is a perspective view of the cooler box showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is another perspective view thereof when the lid is open.

The broken lines showing features on the bottom view depict portions of the cooler box that form no part of the claimed design. 

CLAIM The ornamental design for a cooler box, as shown and described. 